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View Poll Results: What tranny?
build my 4l60-e
15
42.86%
swap for 4l80-e
9
25.71%
do the M6 swap
3
8.57%
TH350 swap
8
22.86%
Voters: 35. You may not vote on this poll

Planning for new trans.... Which one?

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Old Mar 21, 2006 | 07:05 PM
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Default Planning for new trans.... Which one?
Hey everyone. Im planning a turbo build for this following winter. It will be running on stock block and about 450-500 rwhp for the following summer. Then i will throw in a forged block and up the boost. I doubt my 4l60-e will prolly hold even on my low boost at 450 ish rwhp. Even if it does, id feel reassured with something i dont need to worry about. Also note: Id like to swap before mine blows so i can save a grand or so. Now the car will be a daily driver STREET car in summer months. Will need to handle 750 rwhp. I dont highway drive much, mainly around town, hop of highway once n a while, but daily driver. Now i feel i have a few options...

1.) Build my 4l60-e by Rodney
2.) Swap it for a 4l80-e (what would this cost?)
3.) Do an M6 swap with nice clutch (think ill need to get it built too?)
4.) Do a TH350 (cost?)

so what do you think would best suit me?
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Old Mar 21, 2006 | 08:53 PM
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I vote 4l80 especially if its going to be a car you race alot... If its going to be a street only car go built m6....
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Old Mar 21, 2006 | 08:56 PM
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yea, car is STREET ONLY! no track. so you suggest m6 then? About what power can a stock m6 hold with a nice clutch?
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Old Mar 21, 2006 | 09:42 PM
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street only ..4l60e with that kind of power you will never get traction enuff to break things
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Old Mar 21, 2006 | 11:06 PM
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4l80e is a good choice but heavier, You won't break it though. I had built 4l60e's and they didn't hold up to 500+ Tq.
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Old Mar 22, 2006 | 05:27 AM
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ok well weight really isnt an issue much to me. Thats why im posting up different options.... i have heard of a lot of probles with built 4l60-e's. Would i need to get a built T-56 to handle this power or would the stock one work? Why is no one suggesting the TH350?
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Old Mar 22, 2006 | 09:39 AM
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Call up Zack at gearstar and tell him what you are doing. He is very helpful and knows a ****-ton about transmissions. He built my 4l65e (700 hp) and it is AWESOME!
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Old Mar 22, 2006 | 10:55 AM
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yeah if you go m6 you would have to get it built. The reason no one is saying go th350 is because you are building a street car and a th350 has no overdrive.
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Old Mar 22, 2006 | 11:25 AM
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well i mainly drive around in 3rd anyway, why i posted it. Not sure if a built 4l60-e will hold even and i dont want to have to mess around with it if there a chance for problems
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Old Mar 22, 2006 | 11:37 AM
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Then go for a TH400/350 if you don't care about having a 4th gear and lock up. On the freeway it will be pushing some revs but you only run in 3rd gear anyway. These are better suited for the track like said above.

Seriously, it sounds more like you want a M6 for your wants, look into that maybe.
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Old Mar 22, 2006 | 02:46 PM
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yea. id really like to do the M6 swap but seems like a ton of work...
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Old Mar 22, 2006 | 02:54 PM
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It's not to bad, I did it myself. In the future I'm going the TH400 route...

Dan
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Old Mar 22, 2006 | 03:43 PM
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Ah sweet, well i may look into it. But im not very good at manuals, actually i maweful, but i msure ill get plenty better with practice. But with 600-700 rwhp, i dunno how missin a shift the trans would like it. lol
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Old Mar 23, 2006 | 06:00 AM
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Bump... need more input. Im getting nervous because im my dream last night while sleeping my tranny blew! Ahhh hope this doesnt mean anything
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Old Mar 23, 2006 | 06:11 AM
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Do the M6 swap. Much more fun to drive on the street. Talk to Rodney at RPM transmissions ---sponsor--->. He will hook you up. As far as a clutch go with a Spec 3 or 4. They are decently priced and hold the power.

Andy
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Old Mar 24, 2006 | 05:33 AM
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Yea, if i decide to get my A4 built, it will be from Rodney, so if i get an M6, ill prolly go there as well. Ill jsut need to find someone that wants to do an m6-a4 conversion later. With a good clutch on the street will a stock M6 hold up to about how much power?
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Old Mar 24, 2006 | 06:42 AM
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Originally Posted by Superman09
With a good clutch on the street will a stock M6 hold up to about how much power?
Dave Childress (Mightymouse) is running a built T56 with a Spec 5 and has about 900-1000 rwhp. I think you will be fine.

Andy
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Old Mar 24, 2006 | 11:50 AM
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yea well thats built, what about a stock M6 with nice clutch? About what will that hold?
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Old Mar 24, 2006 | 12:57 PM
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Depending on the condition of the trans, and assuming a good clutch AND driver, a stock trans should be able to hold 600hp. This is a EXTREMELY VAGUE assumption due to the amount of variables associated with that question. You can drive the car on the street and beat on it once a week and the trans will go or you could beat on it everyday and the trans could go. I don't really think there is an answer to how much power a stock m6 can hold. Some will say there's broke at 350rwhp, others maybe 550rwhp. It totally depends on the driver skill and driver habits coupled with a good clutch.

Another big problem with the m6's is the hydraulics issue. I believe I have mine nailed good now. I run the stock m6, McLeod twin disc clutch/pressure plate/flywheel/adjustable master cylinder, and a slave cylinder from an 02' SS Camaro. Once bled properly, this clutch feels like stock in terms of pedal pressure. I run a Pro 5.0 shifter and shortened UMI handle and I have nothing but good things to say about the combination.

Good luck
Andy
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Old Mar 24, 2006 | 02:53 PM
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ok thanks man!
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